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Yukon Geological Survey

Occurrence Details


Occurrence Number
105D 222
Occurrence Name
Pueblo
Occurrence Type
Hard-rock
Status
Past Producer


General Information

Primary Commodities: copper, gold, silver
Aliases: Whitehorse Copper
Deposit Type(s): Skarn
Location(s): 60.723930 N, -135.175660 W
NTS Mapsheet(s): 105D11
Hand Samples Available at YGS: No

Capsule

The Whitehorse Copper Belt is located west of Whitehorse and contains 30+ mines, deposits and showings. Many of the occurrences in the Copper Belt are skarns. The skarns form on or near the contact between the Whitehorse batholith and the Lewes River group. The Whitehorse batholith is commonly a grey coarse-grained hornblende granite and ranges from quartz monzonite to granodiorite to diorite. The Lewes River group contains numerous different rock types, most importantly of which is the limestone group, which is essential in the formation of skarns in the area.  A small number of occurrences within the Copper Belt are vein and/or replacement and occur within the Whitehorse batholith granite.

The orebody at the Pueblo deposit occurs within the grey crystalline limestone (Lewes River) intruded by grey hornblende granite (Whitehorse batholith), and are typical contact-metamorphic deposits. The limestone is northerly and northeasterly trending unit up to 800 ft. (244 m) wide. Ore minerals include fine and specular hematite, malachite, azurite, chalcopyrite, bornite, chrysocolla and cuprite. The skarn also presents tremolite, epidote and garnet.

Nearby to the North, scheelite occurs within quartz veins in the granite. The lenticular vein is 110 ft. (34 m) long and 3 ft. (0.9 m) wide at its widest and occurs along a small fault. The vein carries 1-3% bornite and 1-3% scheelite. A second pegmatitic quartz vein stained with copper and has 2% scheelite is located nearby.

The highest production at Pueblo occurred between 1912 and 1920 when 127 000 tonnes of ore was produced at 3.9% Cu.

Location Map

Last Updated: Apr 15, 2019

Work History

Year Work Type Comment
1990 Geochemistry: Rock
1990 Geology: Detailed Bedrock Mapping
1990 Other: Prospecting
1990 Trenching: Backhoe
1973 Geology: Bedrock Mapping
1973 Lab Work/Physical Studies: Petrographic
1967 Geology: Detailed Bedrock Mapping
1967 Ground Geophysics: EM
1967 Ground Geophysics: Magnetics
1967 Other: Line Cutting
1966 Studies: Feasibility
1964 Drilling: Diamond

Regional Geology - Terrane

Group: Intermontane
Affinity: W Laurentia
Name: Stikinia
Realm: peri-Laurentian


Regional Geology - Bedrock

Supergroup:
Group/Suite: Whitehorse
Formation:
Member:
Terrane:
Period Max: Cretaceous
Age Max: 112 MA
Period Min: Cretaceous
Age Min: 105 MA
Rock Major: granodiorite/quartz diorite
Rock Minor:
Reference: Hart & Radloff (1990) - YGS OF 1990-4
Geological Unit (1M): mKW
Geological Unit (250K): mKgW

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
092922 1990 Fox 1-16 MC Prospecting, Trenching and Geochemistry Rock - Geochemistry, Detailed Bedrock Mapping - Geology, Prospecting - Other, Backhoe - Trenching
062018 1973 Preliminary Report on Geological Control to Ore Distribution in the Whitehorse Copper Belt Reverse Circulation - Drilling, Bedrock Mapping - Geology, Petrographic - Lab Work/Physical Studies 665 5555
060011 1970 Geochemical Survey - Summer 1970 Soil - Geochemistry
018884 1967 Geological Mapping, Magnetometer and Electro Magnetic Survey Detailed Bedrock Mapping - Geology, EM - Ground Geophysics, Magnetics - Ground Geophysics, Line Cutting - Other
062227 1966 An Evaluation of the New imperial Mines Ltd. Feasibility - Studies
091123 1964 Summary of assessment work for 316 claims Diamond - Drilling 46 3652.57

Related References

Number Title Page(s) Document Type
091123 Summary of assessment work for 316 claims Assessment Report
092922 Fox 1-16 MC Prospecting, Trenching and Geochemistry Assessment Report
018884 Geological Mapping, Magnetometer and Electro Magnetic Survey Assessment Report
062227 An Evaluation of the New imperial Mines Ltd. Assessment Report
062018 Preliminary Report on Geological Control to Ore Distribution in the Whitehorse Copper Belt Assessment Report
ARMC004814 Interpreted geology map - 200' level - 2455 elev. - Pueblo mine Geoscience Map (Geological - Bedrock)
ARMC004861 Summary report - Pueblo mine Report
1984-1 The Whitehorse Copper Belt - A Compilation Open File (Geological - Bedrock)
ARMC014223 Drillhole location map - Pueblo area Geoscience Map (General)
ARMC004818 Exploration composite map - 200' level - Pueblo area Geoscience Map (General)
ARMC004817 Long section map - Pueblo mine Geoscience Map (General)
ARMC004886 Magnetic survey map - I.P. chargeability contours from 1970 survey - Anomaly 'B' - Pueblo grid Geophysical Map
ARMC004816 Summary Re: Pueblo area Miscellaneous Company Documents
ARMC004815 Report - Pueblo exploration Report
ARMC004819 Correspondence Re: Pueblo area drilling Miscellaneous Company Documents
Citations
Carriere, J J, et al. “Copper Deposits and Occurrences in Yukon Territory.” Ottawa: Geological Survey of Canada, 1982., 1981, doi:10.4095/109350.
Kindle, E.D., “Summary of Research: Field, 1962”; Geological Survey of Canada, Paper no. 63-1, 1963, https://doi.org/10.4095/121464 (Open Access)

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